[kitkat_new]

> Secret chat with multiple devices or with group has the key distribution problem

which is solvable

Signal and Matrix have two distinct approaches to this

[vetinari]

Sure, it is. But it has its own problem.

Signal, for example, copies the received messages into per-device queues that belong to the same identity. The problem for the user is that the user has no visibility into what is really assigned to his identity and where copies of his messages are routed encrypted by which keys; it could be used to implement anything between CALEA to Prism access.

I'm not familiar with the Matrix approach, so I won't comment on it.